Last change
on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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1 | 'use strict';
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2 | var DESCRIPTORS = require('../internals/descriptors');
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3 | var addToUnscopables = require('../internals/add-to-unscopables');
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4 | var toObject = require('../internals/to-object');
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5 | var toLength = require('../internals/to-length');
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6 | var defineProperty = require('../internals/object-define-property').f;
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7 |
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8 | // `Array.prototype.lastIndex` accessor
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9 | // https://github.com/keithamus/proposal-array-last
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10 | if (DESCRIPTORS && !('lastItem' in [])) {
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11 | defineProperty(Array.prototype, 'lastItem', {
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12 | configurable: true,
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13 | get: function lastItem() {
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14 | var O = toObject(this);
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15 | var len = toLength(O.length);
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16 | return len == 0 ? undefined : O[len - 1];
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17 | },
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18 | set: function lastItem(value) {
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19 | var O = toObject(this);
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20 | var len = toLength(O.length);
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21 | return O[len == 0 ? 0 : len - 1] = value;
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22 | }
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23 | });
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24 |
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25 | addToUnscopables('lastItem');
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26 | }
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